121898915 has 8 divisors (see below), whose sum is σ = 146380608. Its totient is φ = 97451200.

The previous prime is 121898911. The next prime is 121898947. The reversal of 121898915 is 519898121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121898915 - 2² = 121898911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121898911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215 + ... + 15615.

It is an arithmetic number, because the mean of its divisors is an integer number (18297576).

Almost surely, 2^121898915 is an apocalyptic number.

121898915 is a deficient number, since it is larger than the sum of its proper divisors (24481693).

121898915 is a wasteful number, since it uses less digits than its factorization.

121898915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16989.

The product of its digits is 51840, while the sum is 44.

The square root of 121898915 is about 11040.7841659911. The cubic root of 121898915 is about 495.8305479839.

The spelling of 121898915 in words is "one hundred twenty-one million, eight hundred ninety-eight thousand, nine hundred fifteen".